Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Gull Wing Mods

Matronics Email Lists Forum Index -> JabiruEngine-List

View previous topic :: View next topic

Author Message

TELEDYNMCS(at)aol.com
Guest

Posted: Sat May 02, 2009 4:55 am Post subject: Gull Wing Mods

In a message dated 5/2/2009 3:08:12 A.M. Eastern Daylight Time,  jabiruengine-list(at)matronics.com writes:

  	  Quote: 	
		  Have you    done this mod???? 	
  

 Greetings,

  

 I have a 3300 installed in a Europa. About two years ago I modified the  "gull wings" to include a hole in them about one sq. in. or so in  total area on each wing. The shape of the hole resembles a pentagram with  the pointy side towards the crankcase. This allows air to spill down the  inside of the heads and between the cylinder barrels. While the gull wing is not  completely removed, this modification did help with lowering head  temps in climb. I recall I tested with the gull wings removed completely  and it did not help my set up.

  

 Last fall I added a "step"  or reverse scoop to my lower cowl just  before the exit hole. This step, or reverse scoop, serves to create an area of  low pressure at the point where the cooling flow exits the lower cowl. The  effect is similar to the "lips" often seen on lower cowls, but is more  aerodynamic. The step was molded onto the lower cowl by carefully shaping foam,  then glassing over it and painting. It extends about 4" below  the lower cowl and belly of the aircraft and is approximately 10" wide,  equal to the width of the exit hole. This helped significantly.  Essentially, what I did was copy what Mooney, Cirrus, Columbia and other  "modern" aircraft are doing in regard to their lower cowls to enhance exit  cooling flow. It also hides the exhaust stacks and helps to hide the Europa's  lower stainless firewall and nose gear leg gusset from the relative wind in  climb and cruise attitudes. Both the lower fire wall and nose gear leg gusset  were flat to the airflow in climb and somewhat exposed in cruise. Manometer  testing showed that these two components were causing an area of high pressure  at the exit hole prior to the installation of the step. The change in the gull  wings and the addition of the step on the lower cowl reduced the ambient  pressure inside the internal head cooling ducts, increasing flow, and lowering  head temps by an average of 25F. Pictures available upon request.

  

 Regards,

  

 John  Lawton

Whitwell, TN (TN89)

Europa N245E -  Flying

 Access 350+ FREE radio stations anytime from anywhere on the web. Get the Radio Toolbar!

  [quote][b]

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

gdh(at)isp.com
Guest

Posted: Sat May 02, 2009 1:10 pm Post subject: Gull Wing Mods

Hi John,

 Your idea(s) seem very sound to me, therefore I  would appreciate the  proffered photos.

 Many thanks,

 Dale

 Tri-Gear/3300

 [quote]   ---

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

oldbldplt(at)aol.com
Guest

Posted: Sun May 03, 2009 10:02 am Post subject: Gull Wing Mods

Hey John,

 

 I'd love to see your pictures... sounds like a neat mod.  Please send to oldbldplt(at)aol.com

 

 Thanks,  Marvin

 

   

 

   

 

 --

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

mhcrowder

Joined: 10 Jan 2006
Posts: 42
Location: Cary, NC

Posted: Mon May 04, 2009 5:40 pm Post subject: Re: Gull Wing Mods

Yes, please post the pictures.



--

Michael

- The Matronics JabiruEngine-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?JabiruEngine-List

Display posts from previous:

	Matronics Email Lists Forum Index -> JabiruEngine-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum